Abrasive wheel truing device



March 15, 1932. w. D. BARTLETT ET AL 1,849,344

ABRASIVE WHEEL TRUING DEVICE Filed Sept. 17, 1928 Danze l l/bev H- Patented Mar. 15, 1932 UNrrr. STATES PATENT] oFF cE WILLIAM 'n. BARTLETT AND DANIELKELLEHER, 0F CLEVELAND, OHIO, ASSIGNO'RSV TO THE ROSS MANUFACTURING COMPANY, er onnvnzannorrro, CORPORATION 01 OHIO I ABRASIVE WHEEL TRUING DEVICE Application filed September 17, 1928. Serial No. 306,592.

This invention relates to, an abrasive'wheel truing device in which greater rigidity of the device is obtained when used against an abrasive wheel and in which the hub bearings are carried in unitary structures which are removable and replaceable without adjustment of the bearings within. the structures and in which the bearing structures are effectively seaied against admission of water, grit, and other foreign matter, and against the escape of oil.

An object of the invention is to provide an abrasive wheel truing device having'a one piece axle.

Another object of the invention is to provide such a devicewith hub bearings assembled as unitary structures which are applied, removed or replaced as such unitary structures.

Another object of the invention is to provide a bearing structure which will lengthen the life of the bearings for such devices due to the fact that the inner orsmaller bearing race is the one that revolves. V

A still further object is to provide an effective water and oil seal for the bearings on an abrasive wheel dresser. 1 p

A yet further object is to provide a support for the hub of such a dresser arranged near the center of the same whereby the dresser may be held against an abrasive wheel with a greater degree of accuracy.

Another object of the invention is to pro-' vide an abrasive wheel dresser having unitary bearing structures which are effectively sealed against the admission and escape or" liquid. I

A still further object of the invention is to provide an abrasive wheel dresser with unitary bearing structures so constructed as to permit ready application and removal of the wheel of the dresser without the necessity of adjusting the bearings for every such removal and replacement.

Another object of the invention is to provide bearing structures for an abrasive wheel;

dresser in which the bearings are arranged in such manner as to prevent improper adjustment of the same when replacing the wheel of the device.

Another object of the invention is to'provide an abrasive wheel dresser which is economical to manufacture, highly e'fiicient in use and which permits ready substitution of the wheel.

It is finally an important object of this invent'ion to providea dresser device of the kind describedwherein the rotary member is supported asa unit uponspaced bearings, the inner races of which rotate thereby assuming a relatively slow bearing speed, the supporting. casing for said device being prowith a plurality of adjustable rests affording a support which absorbs torsional strain imposed on the device and relieves the shank of the tool from strain.

The above, other and further objects of the invention will be apparent from the follow.- ing description, accompanying drawings and appended claims.

, According to the invention, the device includes a closed unitary bearing structure for each end of the hub, which structures are sealed against admission of foreign matter and against escape of oil,together with an arrangement of hearing elements within such structures which prevents improper adjustment of the bearings every time an abrasive wheel is applied to the hub.

One form of the invention is illustrated in the. accompanying drawings and the views thereof are as follows:

Figure 1' is a side elevational View of an abrasive wheel dresser embodying the invention.

Figure 2 is an enlarged verticalsection on line IIII of Figure. 1. i

Figure 3 is a side elevation section of the dresser. p

The form of the invention illustrated in the accompanying drawings comprises a cast metal hood 1 having a member 2integral therewith and a pair of spaced vertically movable rests 3 carried in apertured ears 4 and 5 on the sides of the hood. Therests 3 are threaded for a portion of their length, which threads cooperate with threads in the ears 5. 'Byprovidi'nga pair of rests 3 and the member 2, a three point support is'afforded which absorbs torsional strain and partially in relieves the shank of the tool from strain. The device is further self-adjusting.

The hood 1 is substantially semi-circular in elevation and has on each side thereof a semicircular seat 6.

A strap 7 cooperates with the hoodat each end thereof and is secured in position by bolts 8. The straps 7 and the circular seat 6-form pockets for the unitary bearing structures.

The form of the invention illustrated coi'nprises a fixed bearing structure A and a removable bearing structure 13 which are secured in each side of the hood 1' in a manner above described.

A single axle or shaft 9 is supported in th bearing structures in a manner to behereh after explained.

A hub'1O is mounted'ontheaxle 9, which hub has anannul'ar shoulder 11 against which the abrasive element 12 rest. he abrasive element 12 is-secured against theshoulder 11 nut 13.

The/shoulder 11 has projections 16 formed thereon for cooperation w1th a spanner wrench used when the abrasive element 12 1s 'being'fastenedto or'removed from the hub 10.

The' fixed bearing'A comprises a bearing cage 17 having a shirt 18 in the surface of which isformed an annular groove 19 opening radially outwardly.

I The end-ofthe hub adjacent the fixed bearing A is provided with an annular recess 20 opening axially into which' extends the skirt 18of the bearing cage 17. j

A semi-floating sealing ring 31 of cork or other suitable sealing materialisinserted in the recessor groove 19 of the skirt of the bearing ring-17 by being forced over the out side wall defining such' gro'ove. The depth of the-grooveprovides for-the: compression of the cork ring between the bottom of the groove and the outer surface of theannular 1 recess 20in the hub. The ring 19'iscome pressed against the outside surface of the recess 20 in the hub when the parts are in assembled relation.

A thrust washer 21 is then placed on the axle 9 against the end of the hub 10.-

An inner ball race 22 is then pressed on the axle against the thrust ring 21 and is locked to the axle by means of a lock washer 23 and a lock nut24. The race 22, the washer 23 and the nut'24 are keyed or locked to the axle 9 by a key 25.

An outer ball race 26 is arranged within the bearing ring 17, which race has a sliding fit within the cage.

The outer ballrace 26 is held inbearing alignment-with respect-to the. inner ball race 22' by a retainingmut 27 which'has-threaded engagement with the bearing cage 17. and

The movable bearing structure B'comprises a bearing cage or hood 28 having a skirt 29 provided with a recess opening rad ally outwardly, carrying a cork seallngring 31.

V The end of the hub 10 adjacent the,inov-.

able bearing structure B, has an outer annular recess 32 formed therein into which extendsthe skirt 29 of the bearing cage 28 and against the outer wall of whichthe cork sealingring 31 has a compression fit.

A thrust ring21 is applied over the end of the axle 9'at this end and" against the-end of the hub 10. The innerballrace 22 is pressed onthe axle Qagainst the thrust ring 21 and is retained in position on the axle'9 by'atlock washer 23, lock nut 2st; all of which are lreyed by the key 25 to the axle.

The outer ball race 33 has a floating fit within the bearing carriage 28 and is axially movable with respect to the same. Bearing balls 3 l are inter-posedbetween the inner and outer ball racesof each of the bearing structures. V

' The outer ball race 33 of the movable bearing structure is automatically self-aligning, that is when the parts are assembled as shown inthe drawings, thisouterball r'ace33 will adjust itself to proper aligning bearing positionwith respect to its inner ball race The bearingstructure B is closedatits oute1 andby an inclosure' ainscrew threaded engagement with the bearing'cage'28. It will be observed-that the structure just described provides in ayfixed bearing A a bearing arrangementwhich is adj ustedin the unitary structure so as atalltimes to afford ample friction reducing cooperation between the hub10 and the'hood 1. The movable bearing structure'B is' the one which is removed and replaced whenever it is necessaryto renew the abrasive wheel or element 12.- The construction-to the bearing structure B just described prevents any improper adjustmentiof-t'he bearing within this StlllCtllI'Bj so that: a careless ori inexperienced operator cannot assemble the device in any but the proper "way. The device:is' usedito'true wheels by scour ing the'member '2 in asuitable clamping device and'resting the adjustable rests 3 on the shelf or tool restof the'machine. The members" 3 1nay' be adjusted vertically so as to bring the abrasive element 12 inproper re-- lation with thewheelto be dressed so that the dresser 'will have proper'support vertically on s thev shelf of the machine. Furthermore, the provision of'athe-rests 3with the member 25a three pointsupport' forthe abrasive ele' ment 12 near the axle or huib oftheTsame-is secured, thus increasing the efliciency the machine and making possibleabetter'and being treated. v

The seal betweenthehublO and the hearing structures A and B is such as to prevent entrance of water, grit, or other foreignfinaltsj ter to the bearing structures and to prevent escape ofoil from the bearing structures, thereby lengthening the liif'e of these bear-- ing structures.

The end closures 27 and may beprovided with oil holes 36 whereby lubricant maybe supplied to the bearing structures. 7

We have found that the use of the cork sealing rings is etficient for the purpose intended, as these cork rings will outlast the ball bearings when properly treated before installation. The oil supplied to the bearing structures reaches the cork sealing rings, thus more accurate dressing of the grinding wheel lubricating the same and lengthening the life of these sea-ling rings. The cork rings retain their resiliency for a long period of time in the arrangement hereabove described.

WVhen it is desired to remove the abrasive element 12, the straps 7 are removed from the hood of the. axle and its associated hearing structure and hub and are taken out bodily. The inclosure 35 is then unscrewed from the removable bearing structure B, the lock nut 2a is removed and also the lock washer, whereupon a bearing puller is screwed into the bearing cage 28 thus removing the bearing cage 28 as a unit. When this has been done, the lock nut 14 and the nut 13 are unscrewed from the nut 10 whereupon the used abrasive 12 may be removed and a new one applied. 7

Should it so happen that it is necessary to remove the fixed bearing structure A from the axle, such removal is accomplished as follows. 1

The inclosure 27 is unscrewed from the bearing cage 17, the lock nut 24, lock washer 23 are then removed and bars are inserted through axle holes 37 in the hub 10, which bars drive against the thrust washer 21 driving off the inner ball race 22.

It will be observed that such a device is efficient because of the rigid mountings of the bearings and the arrangement of the bearing elements against improper adjustment. F urthermore, the provision of the sealing rings and bearing cages exclude admission of grit,

water, and other foreign matter from the bearing structures and at the same time confine the lubricating oil within the bearing structures.

lVhile we have described more or less precisely the details of construction of our invention, yet we do not wish to be understood as limiting ourselves thereto as we are aware that changes may be made in the arrangement and proportion of parts and that equivalents may be substituted, all without departing vention. We claimas our invention 1. An abrasive wheel truing device including. a revolva'blesaxle, a hubcon said axle, bearing structures for each end of'said hub, a 'st'ationary closure member for each end of said structures, and means for retaining each of saidbearings in the sameposition of adjustment within said closures. p V

2. An abrasive Wheel truing device including a revolvable axle, a hub,0n said axle,

hearings for each end of said hub, a stationary closure member for each 'of said bearngs, a side closure comprlsing a bearing cage having an axle skirt with an annular groove from the spirit and scope of curin in said skirt, the plane of which is perpen- I dicular to the bearing axis, a cork ring within said groove inserted therein by being forced over a wall of saidgroove, said hub having an annular recess the walls of which receive said cork ring and press the same in said groove to provide a seal hub and said bearing.

3. An abrasive wheel truing device in? cluding an axle, a hu'b on said axle, said hub havlng an'annular recess in each end, abearbetween said mg structurefor each end of said hub, a 2

bearing structure comprising an 'imperforate bearing cage havingg'a' skirt projecting into the hub recess adj acent its end, a sealing ring carried by said skirt and pressing against the outer wall of said recess, a thrust ring against the end of the hub, an inner'ball race pressedagainst said ring and locked to said axle, an outer ball race slidably mounted Within said bearing cage, ball bearings between said races, and said outer ball race being axially movable for hearing adjustment with respect to said inner ball race.

*4. An abrasive wheel truing device including a revolvable'axle, ahub on said axle, said hub havingan annular recess in each end,

ioo

similar bearing structures for each end of said hub, a bearing structure comprisinga bearing cage havmg a skirt pr'o ect1ng into the hub'recess at its end, saidskirt having a groove therein opening readily outwardly, a cork ringwithin said groove having compressive engagement with the outer wall of said recess for providing a seal between said bearing structures for said hub, one of said bearing structures being fixedywith respect to said head and tl1e other being movable,

each of said structures comprising a bearing cage, a thrust ring against eachend-of sa d hub within the cage, aninnerball race pressed against said ring and locked ito said axle, an outer ball race slidable within'said bearing cage, ball bearings between said races, a seallng' ring between each of said bearing cages an s 2 9f sa ub m a s i se ie edv th the fixed bearing structure for posi'tion n-gthe "outer ball race in said structure. in bearing alignment with its inner ballracqthe outer ballfnac in said movable aring structure beingv axially movable within itsbeari'ng cage for-automatic'bearing alignment with its in} her, ball race, and, anend-clo'sure for. cachet said bearing structures. 1 g V 6. An abrasive ii heel truing device co n, prisinga head,an axie removably carried in said head, an abrasive wheel hub on said axle, bearing structures for said hub, one of said bearingstructures being fixed withirespect tofsaid head and the other being movable, acli or said structures comprising a bearin a. thrust ringcagainst each end of said liubvvithin thecage, an inner ball race pressed against saidring and locked to, said axle, an outer ballrace sli dable Within said bearing cage,bal1 bearings between saidiraces, 'a sealing. ring between each of said bearing cages and its end of said hub, means associated with thefixed bearing structure. for positioning the out-er ball racein said st ructure in bearing alignment With its inner. ball r.ace,rthe o iter ballvra ce in said movable bearing structure being axially "movable within its bearing cage for, automatic bearing alignment with its innerball race, an end closure vforeach of said bearing, structures, Silldhllb having an axicage,

ally opening annular recess in each end theree of, each of said bearing cages having a skirt extending. into the, hub recess at its end of the; hub, said skirts having radially opening grooves therein, and cork rings in said grooves co npressivelyengaging the outer Walls. of said hubrecesses forproviding a seal between said bearingstructures and sajidhub.

7'. An abrasive Wheel-dresser comprisingja head, a revolvable. axle removably carried by saidhead, a hub on said axle, said hub ar ranged for supporting an abrasive wheelior rotation therewith, unitary bearing struc-' tures carried by said head for supporting said hub, said bearing, structures!enclosing bear; elements,. said bearing structures arranged to'be. applied and removed as a unit with; out aflie'ctingthe adjustment oft he. bearing eleinentsl vithin said bearing structures,

8... All abrasive Wheel truing devicej comprising an axle, ahilb on said axle, bearings for each'cendo f said hub, and a cork ring seal between each of said bearings and; said hub, said ring being, mounted compressed between opposed engaging surfaces. 9. abrasive; Wheel, truing device, com-v prising an axle, a hub on said axle, bearings forv each, end of said hub, and a cork ring seal between, each of said bearings'and said hub, said ring being, mounted compressed between. opposed engaging surfaces, and being mounted for limited axial movement along Said, hub.

-- 3 .9, I es abrasi e W ee w ns i n on said ax1'e,said hub having a longitlldi'nal-c- 1y extending annular flange, a bearing for said axle, a hood on said bearing having a' portion thereof projecting under said annular flange in spaced opposed relation thereto, and a cork ring seal' seated compressed between said flange and said projecting portion of said hood to prevent dirt from entering said bearing.

In testimony whereof, We have hereunto subscribed our names at Cleveland, Cuyahoga County, Ohio. s

WILLIAM' I). BARTLETT.

DANIEL KELLEHEB. 

